xref: /openbmc/linux/drivers/mtd/nand/spi/micron.c (revision 6d99a79c) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2016-2017 Micron Technology, Inc.
4  *
5  * Authors:
6  *	Peter Pan <peterpandong@micron.com>
7  */
8 
9 #include <linux/device.h>
10 #include <linux/kernel.h>
11 #include <linux/mtd/spinand.h>
12 
13 #define SPINAND_MFR_MICRON		0x2c
14 
15 #define MICRON_STATUS_ECC_MASK		GENMASK(7, 4)
16 #define MICRON_STATUS_ECC_NO_BITFLIPS	(0 << 4)
17 #define MICRON_STATUS_ECC_1TO3_BITFLIPS	(1 << 4)
18 #define MICRON_STATUS_ECC_4TO6_BITFLIPS	(3 << 4)
19 #define MICRON_STATUS_ECC_7TO8_BITFLIPS	(5 << 4)
20 
21 static SPINAND_OP_VARIANTS(read_cache_variants,
22 		SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
23 		SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
24 		SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
25 		SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
26 		SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
27 		SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
28 
29 static SPINAND_OP_VARIANTS(write_cache_variants,
30 		SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
31 		SPINAND_PROG_LOAD(true, 0, NULL, 0));
32 
33 static SPINAND_OP_VARIANTS(update_cache_variants,
34 		SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
35 		SPINAND_PROG_LOAD(false, 0, NULL, 0));
36 
37 static int mt29f2g01abagd_ooblayout_ecc(struct mtd_info *mtd, int section,
38 					struct mtd_oob_region *region)
39 {
40 	if (section)
41 		return -ERANGE;
42 
43 	region->offset = 64;
44 	region->length = 64;
45 
46 	return 0;
47 }
48 
49 static int mt29f2g01abagd_ooblayout_free(struct mtd_info *mtd, int section,
50 					 struct mtd_oob_region *region)
51 {
52 	if (section)
53 		return -ERANGE;
54 
55 	/* Reserve 2 bytes for the BBM. */
56 	region->offset = 2;
57 	region->length = 62;
58 
59 	return 0;
60 }
61 
62 static const struct mtd_ooblayout_ops mt29f2g01abagd_ooblayout = {
63 	.ecc = mt29f2g01abagd_ooblayout_ecc,
64 	.free = mt29f2g01abagd_ooblayout_free,
65 };
66 
67 static int mt29f2g01abagd_ecc_get_status(struct spinand_device *spinand,
68 					 u8 status)
69 {
70 	switch (status & MICRON_STATUS_ECC_MASK) {
71 	case STATUS_ECC_NO_BITFLIPS:
72 		return 0;
73 
74 	case STATUS_ECC_UNCOR_ERROR:
75 		return -EBADMSG;
76 
77 	case MICRON_STATUS_ECC_1TO3_BITFLIPS:
78 		return 3;
79 
80 	case MICRON_STATUS_ECC_4TO6_BITFLIPS:
81 		return 6;
82 
83 	case MICRON_STATUS_ECC_7TO8_BITFLIPS:
84 		return 8;
85 
86 	default:
87 		break;
88 	}
89 
90 	return -EINVAL;
91 }
92 
93 static const struct spinand_info micron_spinand_table[] = {
94 	SPINAND_INFO("MT29F2G01ABAGD", 0x24,
95 		     NAND_MEMORG(1, 2048, 128, 64, 2048, 2, 1, 1),
96 		     NAND_ECCREQ(8, 512),
97 		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
98 					      &write_cache_variants,
99 					      &update_cache_variants),
100 		     0,
101 		     SPINAND_ECCINFO(&mt29f2g01abagd_ooblayout,
102 				     mt29f2g01abagd_ecc_get_status)),
103 };
104 
105 static int micron_spinand_detect(struct spinand_device *spinand)
106 {
107 	u8 *id = spinand->id.data;
108 	int ret;
109 
110 	/*
111 	 * Micron SPI NAND read ID need a dummy byte,
112 	 * so the first byte in raw_id is dummy.
113 	 */
114 	if (id[1] != SPINAND_MFR_MICRON)
115 		return 0;
116 
117 	ret = spinand_match_and_init(spinand, micron_spinand_table,
118 				     ARRAY_SIZE(micron_spinand_table), id[2]);
119 	if (ret)
120 		return ret;
121 
122 	return 1;
123 }
124 
125 static const struct spinand_manufacturer_ops micron_spinand_manuf_ops = {
126 	.detect = micron_spinand_detect,
127 };
128 
129 const struct spinand_manufacturer micron_spinand_manufacturer = {
130 	.id = SPINAND_MFR_MICRON,
131 	.name = "Micron",
132 	.ops = &micron_spinand_manuf_ops,
133 };
134